This paper illustrates a query language by four fields:support of object-oriented, expressive power, support of collections, and usability.
从支持面向对象、可表达能力、支持集合和可用性等四个方面来说明一个查询语言。
According to that view we design the object-oriented workflow model and the visual model tool, and develop a workflow original system to test the workflow model's usability.
本文根据面向对象的工作流建模思想，设计了工作流元模型及其可视化的建模工具。为了验证工作流模型的可用性，开发了工作流执行服务原型系统。
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